Double-trap siphon.



PATENTBD Muir-1 1, 1904..

SgWpMILLEm y DOUBLE TRAP sIPHoN.'

APPLICATION' FILED SEPT. 8, 19.03l

N0 MODEL.

1n: nofws PETERS co. moraumo. wAsuwnYoN c No. 261.316,l

Patented May 31, 1904.

'PATIENT GFFICE.

SIISNEY w. MILLER, AoF CHICA-Go, ILLINOIS.

DOUBLE-'TRAP .S|`|W=HoN. Y

SPECIFICATION forming part of Letters Patent No. i761,3'I 6, dated May 31, 1904.

i Application filed September 8, 19Q3. Serial No. 172,208." (No model.) i i i T0 all whom, it may concern? Be it known that I, SIDNEY MILLER,- of Chicago, in the county of Cook and ,Stateof Illinois, have invented certain new and useful Improvements in Double-Trap Siphons; andV I do hereby declare that the following isa full,

clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in automatic siphons for emptying liquid-containing tanks,and refers more specifically to vthat class of siphons'known as double-trap siphons, wherein the Siphon is provided in addition to a main or'principal trap connected with the outlet-limb thereof with an auxiliary trap having a'llessfdepth ofv seal than .that of the main trap and designed to be forced or blown off to bring the Siphon into operation before there is suiicient pressure in the Siphon to force the main trap.

The apparatus herein disclosed is generally like the double-trap Siphon shown in my prior United States Letters Patent, No. 7 27 ,990, is,- Sued May'lfZ, 1903, wherein the auxiliary Siphon is so located as to be accessible for ad'- justment or repair without disturbing the Setting of the main Siphon. shown in said prior patent the auxiliary trap is located outside of the chamber which thel Siphon is designed to empty, while in the construction herein shown said auxiliary trap is located in the same chamber, and I am thereby enabled to apply said new structure in 'places where a separate chamber is not at hand the maximum depth of seal of the trap. 'The auxiliary trap is located with its effective partI outside of the Siphon in order to vpermit the trap to be readily applied to the Siphon or de- In theconstruction tachcd therefrom without the necessity of deranging or interfering with the siphonfsetting. Such location o f the trap also enables the same to be ladjusted without interfering with the Siphon in a manner to bring the Siphon into operation at different liquid-levels in the tank icontaining the sip'ho'nfas will hereinafter deep trap b2, which may be of any suitable form and the vshorter or outlet limb of whichs discharges into a pipe'C, which leads to a sewer or other suitable place for the disposal of the liquid. In the instance Shown the shorter or intakelimb o f the Siphon consists of an inverted bell which -fis placed over the intaking end of the outlet-limb of the Siphon ina familiar manner. The form of the trap o f the Siphon.V may be like that shown in my prior patent above referred to; but,`as herein shown, itY consists of asingle hollow casting provided with a vertical partition b3, extending almost to the bottom of the casting and dividing the trap into a receiving and discharge limb.

Referring now to the auxiliary trap, which attachment constitutes the present invention,

these parts are made as follows: D designates'- as a whole Saidvtrap, which communicates with the interior. of the Siphon by means of a connecting-pipe E, which is shown as bent downwardly at its end remote from the trap- D and enters the Siphon through the top of theintake-limb or bell and extends into the' outlet-limb of the Siphon a distance slightlyV below the level of the lower .marginof said bell.

Said connecting-pipe E may, however, communicate with the Siphon otherwise than hereinv shown. The upper part of the connecting-pipe E may or may not be located be- B designates as a whole av deep-v low the maximum liquid-level of the tank, as desired. Said trap is located with its effective sealing part wholly within the tank A and consists of a shorter or intake-limb (l, which communicates with the pipe E and extends downwardly therefrom, and a longer or outlet limb d, which is attached at its lower end to the lower end of the intake-limb by means of a curved fitting in the manner shown. The outlet-limb of the auxiliary trap is herein shown as made of a length to extend at its upper end above the maximum liquid-level in the tank. The parts of the auxiliarytrap are so proportioned relatively to the trap of the main siphon that the effective sealing column of liquid therein is shorter than the corresponding column of liquid. in the deep-seal trap, whereby the pressure existing in the siphon during the filling of the tank acts to force the seal of said auxiliary trap before said pressure is sufficient to force the seal in the deep-seal trap, it being the intent that said siphon shall always be started by the forcing of the auxiliary trap and never by the forcing of the deep-seal trap.

The auxiliary trap is automatically refilled after it hasbeen blown to release the pressure in the siphon, and during the first part ofthe emptying operation in the same manner as the auxiliary trap shown in my said prior patent is refilled. The refilling means consists of a pipe F, which is connected with the intakelimb of the auxiliary-trap and depends therefrom to a level somewhat above the level of the connection between the lower ends of the limbs of the auxiliary trap. Said refillingpipe, the Aconnecting-pipe E, and the -intakelimb of the auxiliary trap are connected by a T-joint for other suitable fitting. After the seal of the auxiliary trap is forced or blown and when the siphon is in operation the head of the liquidin the tank acts to force liquid up through the refilling-pipe F into the auxiliary trap and refills said auxiliary trap. In the form of apparatus shown a portion of the water forced upwardly through said refillingpipe F is directed through the connectingpipe E to the siphon; but if said connectingpipe be located partly above the liquid-level no part of the liquid `passing upwardly through the pipe F will find its way to the siphon. In the continued fall of theliquid-level in the tank A some of the liquid is drawn from the auxiliary trap by siphonic action from the pipe 0l through the pipe F; but such siphonic action ceases as soon as the liquidlevel falls below the lower or intake end of the pipe F. When the auxiliary trap is refilled in the manner stated, the liquidwill rise in the outlet-limb d thereof to approximately the level of the liquid in the tank, and as the tank-level falls the level in said pipe d falls with the same. It will be seen, therefore, that at the time the lower end of the refilling-pipe F is uncovered by the fall of liquid in the tank there isa column of liquid in the auxiliary trap of a length equal to the length of the inlet-limb d of said auxiliarytrap, (said inlet-limb being entirely filled,) plus the length of the liquidcolumn remaining in the lower end of the ontlet-limb d of said auxiliary trap, the length of which latter will be equal to the distance between thelevels of' the lower ends of the refilling-pipe F and outlet-limb d of the auxiliary trap. To this column will be added the liquid contained in the horizontal parts of the trap connecting, respectively, the lower ends of the limbs of the trap and the upper end of the inletlimb of the trap and the refilling-pipe. As soon as siphonic action has ceased in the auxiliary trap the liquid in the several parts of said trap settles back into the lower end of the trap, the liquid findinga common level in the two limbs of the trap. In the next filling of the tank the pressure produced in the siphon after the lower end of the refilling-mpc is sealed acts to drive the liquid from the inlet to the outlet limb of the trap, and the length of said column after it has been transferred to the outlet-limb of the trap constitutes the effective sealing column, which, as before stated, is of less length than the sealing eolumn of the main trap. The seal of the auxiliary trap is therefore forced before the seal of the main trap and starts the siphon into action. It will be observed that so long as the auxiliary trap is contained wholly within the tank A theoutlet-limb of said trap will need to be made sufficiently long to extend above the level of liquid required to furnish a head to force said auxiliary trap to prevent the upper end of said outlet-limb being submerged by the liquid,v though in some instances the open end of said outlet-limb may extend laterally out of the tank below the maximum liquid-level thereof.

The auxiliary trap and the refilling and connecting pipes mentioned are of such form and so arranged that they may be readily applied as an attachment to any type of deep-seal siphon and may be readily applied to a siphon which is already set or installed. The said parts, therefore, which constitute a unitary structure, are hereinafter claimed as an attachment, as well as claimed in combination with the siphon.

I claim as my inventionl. The combination with a tank and asiphon for emptying the same having a trapped discharge-limb, of an auxiliary trap for said siphon located in said tank and outside of the siphon and having a less depth of effective or working seal than that of the main trap and means for refilling the auxiliary trap from the liquid in the tank before it has passed into the siphon 2. The combination with a tank and a siphon for emptying the same having a trapped dis- IOO charge-limb, of an auxiliary trap for said siphon said trap being located outside of the Siphon and Wholly Within the tank and accessible for removal or adjustment Without disturbing the Siphon-setting, and means for reiilling said trap.v

3. The combination With a tank and a Siphon for emptying the same having a trapped discharge-limb, of an auxiliary trap comprising the parts d d ycommunicating with the interior of the siphon as by the pipe E, the effective parts of said trap being locatedwithin said tank and outside of the siphon.

4. The combination With a siphon having a trapped discharge-limb, of an auxiliary trap for said siphon located outside of the siphon and Within the tank comprising a short receiving-limb and a longer discharge-limb, the upper" end oi' which latter is located above the maximum liquid-level required to force the auxiliarytrap, a pipe connecting said receiving said auxiliary trap.

5. An attachment for deep-seal siphons comi prising an auxiliary trap having a receivinglimb and a- 'discharge-limb, the latterl being made of such length as to extend above aliquid-level required to force said auxiliary trap, a pipe connected With said auxiliary trap and constructed to be inserted into a deep-seal siphon, and a refilling-pipe communicating with and-depending from said .connecting-pipe. y

In testimony that I claim the foregoing as my inventionI aiiix my signature, in presence of two Witnesses, this 31st day of August, A. D. 1903.

` SIDNEY W. MILLER. 'Witnessesz WILLIAM L. HALL, p GERTRUDE BRYGE. 

